Variation in milk iodine concentration around the world: a systematic review and meta-analysis of the difference between season and dairy-production system

Tattersall, J. K., Peiris, M. S., Arai, M., McCully, K., Pearce, N., Rayman, M. P., Stergiadis, S. ORCID: https://orcid.org/0000-0002-7293-182X and Bath, S. C. (2024) Variation in milk iodine concentration around the world: a systematic review and meta-analysis of the difference between season and dairy-production system. Food Chemistry, 459. 140388. ISSN 0308-8146 doi: 10.1016/j.foodchem.2024.140388

Abstract/Summary

Iodine is essential for thyroid hormone production. Milk and dairy products are important sources of iodine in many countries. We aimed to review systematically the variation in milk-iodine concentration between countries, seasons and farming practice. We searched online food composition tables and published literature for data since 2006. Milk-iodine concentration was available for 34 countries (from 66 sources) and ranged from 5.5 to 49.9 μg/100g (median 17.3 μg/100g). Meta-analyses identified that iodine concentration is significantly higher in: (i) winter than summer milk (mean difference 5.97 μg/100g; p = 0.001), and (ii) in conventional than in organic milk (mean difference 6.00 μg/100g; p < 0.0001). Sub-group analysis showed that the difference between organic and conventional milk was only significant in summer (p = 0.0003). The seasonal variation in milk-iodine concentration may affect iodine intake and status so should be considered in dietary surveys, and when assessing population iodine status.

Item Type	Article
URI	https://reading-clone.eprints-hosting.org/id/eprint/117125
Item Type	Article
Refereed	Yes
Divisions	Life Sciences > School of Agriculture, Policy and Development > Department of Animal Sciences
Publisher	Elsevier
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